From 7a13a515d9b10a789d20f9ec8e4e52b1112ed171 Mon Sep 17 00:00:00 2001
From: german77 <juangerman-13@hotmail.com>
Date: Sat, 1 Jan 2022 21:25:30 -0600
Subject: core/hid: Add fallback to fullkey controllers

---
 src/core/hid/emulated_controller.cpp | 34 ++++++++++++++++++++++++++++++----
 src/core/hid/emulated_controller.h   |  6 ++++++
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/src/core/hid/emulated_controller.cpp b/src/core/hid/emulated_controller.cpp
index 2d3fce276..71fc05807 100644
--- a/src/core/hid/emulated_controller.cpp
+++ b/src/core/hid/emulated_controller.cpp
@@ -879,10 +879,36 @@ void EmulatedController::SetSupportedNpadStyleTag(NpadStyleTag supported_styles)
     if (!is_connected) {
         return;
     }
-    if (!IsControllerSupported()) {
-        LOG_ERROR(Service_HID, "Controller type {} is not supported. Disconnecting controller",
-                  npad_type);
-        Disconnect();
+    if (IsControllerSupported()) {
+        return;
+    }
+
+    Disconnect();
+
+    // Fallback fullkey controllers to Pro controllers
+    if (IsControllerFullkey() && supported_style_tag.fullkey) {
+        LOG_WARNING(Service_HID, "Reconnecting controller type {} as Pro controller", npad_type);
+        SetNpadStyleIndex(NpadStyleIndex::ProController);
+        Connect();
+        return;
+    }
+
+    LOG_ERROR(Service_HID, "Controller type {} is not supported. Disconnecting controller",
+              npad_type);
+}
+
+bool EmulatedController::IsControllerFullkey(bool use_temporary_value) const {
+    const auto type = is_configuring && use_temporary_value ? tmp_npad_type : npad_type;
+    switch (type) {
+    case NpadStyleIndex::ProController:
+    case NpadStyleIndex::GameCube:
+    case NpadStyleIndex::NES:
+    case NpadStyleIndex::SNES:
+    case NpadStyleIndex::N64:
+    case NpadStyleIndex::SegaGenesis:
+        return true;
+    default:
+        return false;
     }
 }
 
diff --git a/src/core/hid/emulated_controller.h b/src/core/hid/emulated_controller.h
index d887eca87..c0994ab4d 100644
--- a/src/core/hid/emulated_controller.h
+++ b/src/core/hid/emulated_controller.h
@@ -320,6 +320,12 @@ private:
     /// Set the params for TAS devices
     void LoadTASParams();
 
+    /**
+     * @param use_temporary_value If true tmp_npad_type will be used
+     * @return true if the controller style is fullkey
+     */
+    bool IsControllerFullkey(bool use_temporary_value = false) const;
+
     /**
      * Checks the current controller type against the supported_style_tag
      * @param use_temporary_value If true tmp_npad_type will be used
-- 
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